method_error

This is cars.rb:


class CarImport
           attr_reader :car_type
           def initialize (type)
                  @car_type = type
           end
end

This is tests.rb:


 require 'test/unit'
 require_relative 'asserts'

 class TestAsserts < Test::Unit::TestCase
           def test_initialize
                   car1 = CarImport.new("Toyota")
                   assert_equal "Toyota", car1.initialize
           end
   end

However I get the following error when I run ruby tests.rb:
`NoMethodError: private method `initialize' called for #<CarImport:0x00000000cbb1a0 @car_type="Toyota">
`